VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Splitwise - Splitwise is a free tool for friends and roommates to track bills and other shared expenses, so that everyone gets paid back. On the web, iPhone, and Android!
AIMP - AIMP : Free Audio Player : Официальный сайт программы
SplittyPie - Create event, add users and their expenses.
foobar2000 - An advanced freeware audio player for the Windows platform.
Kittysplit - The easiest way of sharing costs with a group of friends